Coarse and fine control of segmented video playback apparatus with ancillary recording medium
US4290087A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 1979 |
| Grant date | Sep 15, 1981 |
| Priority date | — |
| Expiry date | May 11, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/90
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system for playback of segmented video information on a tape employs an ancillary recording medium which is rotationally driven at the rotational rate of a primary segment scanning apparatus. Each segment of a video field is recorded in a respective track of the ancillary medium, the information of one field being recorded over the information of another field. By recording only signals of a predetermined quality on the ancillary recording medium, playback of video information from the ancillary medium will produce a coherent display on a display monitor, regardless of the rate at which the tape is run. This is possible because of the one-to-one correspondence between the rotary rates of the scanner and the ancillary medium. Each coherent display is comprised of information from one or a number of video fields. To determine whether signals to be recorded are of the predetermined quality a coarse and a fine measure of signal quality are provided and logically combined. The coarse measure is provided by use of respective identifier tones for the field segments which are played, the purity of the played tones being somewhat determinative of playback signal quality. The fine measure …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.